Feed leon geegoey



2 sheets-#sheet 1.

l(No Model.)

F. L. GREGORY. LATHB'GHUGK.

No. 374,405. Patented Dec. 6, 1887.

...nr N i afdw gf/f7 1520922201:

. (No Model.) 2 Sheets-#Sheet 2.

I'. L. GREGORY.

LATHE CHUCK.

No. 374,405. Patente-d nec. s, 1887.

UNITED STATES PATENT OFFICE.

FRED LEON GREGORY, OF NIAGARA FALLS, NEV YORK.

LATHECHUCK.

SPECIFICATION forming part ofLetters Patent No. 374,405, dated December 6, 1887.

4 Application filed March 9, 1887. Serial No. 230,190. (No model.)

To aZZ whom it may concern:

Be it known that I, FRED LEON GREGORY, of Niagara Falls, in the 1county of Niagara and State of New York, have invented new and useful Improvements in Lathe Chucks, of which the following is a specification.

This invention relates to that class of lathechucks which are known as eccentric chucks,77 in which the work-holding plate or face-plate can be arranged cccentrically to the lathe-spindle and can be turned to bring different portions of the work opposite the tool. (A chuck of this character is shown in Letters Patent No. 327 ,791, granted to me October 6, 1885.) These chucks are used, for instance, for producing ornamentations consisting of annular rows of intersecting circles. In producing such ornamentations the face-plate must be turned on its supporting back plate after a circle has been formed in order to place the work in position for the formation of the next circle. In the chuck described and shown in my aforesaid Letters Patent thisl turning movement of the face-plate is effected by hand and requires considerable attention and care on the part of the operator.

The principal object of my present invention is to effect this turning movement of the faceplate automatically.

Another object of my invention is to inl-- prove the construction ofthe devices whereby the several parts of the chuck are held together.

My invention consists of the improvements, which will be hereinafter fully set forth, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a sectional side elevation of my improved chuck. Fig. 2 is a rear elevation of the chuck. Fig. Sis a longitudinal section of the same. Fig. ft is a section at right angles to Fig.A 3. Fig. 5 is a longitudinal section, on an enlarged scale,oftheautomaticfeed mechanism attached to the chuck. Fig. 6 is a front elevation of the actuating-pawl and connecting part-s of the feed mechanism. Fig. 7 is a top plan view of the same, partly in section. Fig. 8 is a sectional elevation of the bolt and set-screw whereby the work-holding plate is attached to its supporting-ring. view of said bolt.

front elevation of the mandrel-plate.

Fig. 9 is a perspective Fig. l0 is a fragmentary Fig. 11

is a front elevation of the,stationary collar on the bearing of the mandrel. Fig. l2 is a fragmentary elevation showing a modified construction of the automatic feed mechanism.

Like letters of reference refer to like partsy in the several figures.

A represents the work-holding plate or faceplate, which may be ot any ordinary or suita- 6o Y ble construction, and which may be provided with any suitable devices for securing the work to the same. As shown in the drawings, the faceplate is provided with clampingjaws a,

which are opened and closed by a scroll-ring, 55

and entering a corresponding depression in the back of the face-plate A.

c c represent horizontal bolts arranged in cylindrical sockets in the eccentric plate B on diametrically-opposite sides thereof, and provided at their front ends with flat heads c', 8c

which engage in an annular groove, c, formed in the bore of the face-plate A.

d represents radial setscrews arranged in the eccentric plate B and engaging with their tapering inner ends in tapering recesses d', 85

formed in the bolts c, thereby holding the latter in their sockets and the face-plate A against the face of the eccentric plate B. By tightening the set-screws d the bolts c are drawn into their sockets in the eccentric plate and the go face-plate A is clamped tightly against the eccentric plate B.

e represents the mandrel of the lathe, and E the bearing in which it turns.

F is a plate or disk secured to the screwthreaded end of the mandrel, and F is a plate secured to the face side of the plate `F by screws f. The plate Fis centered on the plate F by an annularrib, f', formed on the plate F and entering a corresponding groove in the 10o plate F. The plates F and F form together the concentric mandrel-plate of the lathe.

G represents a dovetail or undercut rib formed .diametrically on the face side of the plate F and entering a corresponding groove formed in the rear side of the eccentric plate B, so that `the lattercan be moved out of center on the mandrel-plate by sliding it on the rib G.

H represents the adj ustingscrew, arranged between the mandrel-plate and the eccentric plate B, and resting in a semi-cylindrical groove formed lengthwise in the face of the ro dovetail rib G and a similar groove formed in the rear side of the eccentric plate B. The screw H is held againsty longitudinal movement by projections h, formed on the rear side of the eccentric plate B and entering annular .'5 grooves 7L', formed in the screw H.

I represents a half-uut seated centrally in the mandrel-plate F and engaging with the screw H, so that b v turning the screw the eccentric plate B is moved on the dovetail rib 2o G toward or from the center of the mandrelplate. Thehalfnut I is held against the screw H by a screw-threaded follower, i, which is arranged in a central threaded opening in the plate F. One wing of the dovctail rib G is preferably severed from the plate F by a slit, j, and provided with an adjusting-screw, j', by

which the wear can be taken up.

k represents an annular row of ratchet-teeth formed in the rear side of the face-plate A on 3c the outer side of the groove in which the annular rib b of the eccentric plate B engages, and 7c is a spring detent-pawl which is seated in the plate B and engages with the ratchetteeth 7c, so as to prevent retrograde movement of t-he same.

Z represents theactuating-pawl, arranged in a circular head, L, which latter is provided in its front side with a diametrical groove, Z, in which the pawl plays. The latter is piv- 4o oted at its lower end to the head L and provided at its upper end with a head, Z2, which engages with the ratchetteeth la. The head Z2 is provided with an abrupt face and an inclined back, so that its forward movement i5 causes the face-plate A to be turned while it slides over the ratchet-teeth during its backward movement. The pawl Z is held in engagement with the ratchet-teeth by a spring, m. The head L is arranged ina recess formed 5o in the front side of the eccentric plate B and provided with an axial stem, N, which extends rearwardly from the head and turns in a socket or bearing, n, formed in the eccentric plate B and extending rearwardly therefrom.

53 The mandrel -plates F F are cut away, as shown at n' in Fig. 2, to make room for the rearwardly-extending portion of the bearing n.

o represents a spring which is coiled around the stem N in rear of the bearing n, and which 6o is secured with its front end to the bearing n and with its rear end to a collar, P, which is mounted on the stem N. The collar P is provided with an internal screw-thread., which engages with an external screw-thread on the stem.

p represents the actuating-arm, attached to the rear end of the stem N in such a posiltion that it comes in contact with a fixed stop,

q, on the lathe by the rotation of the chuck, whereby the stem N is turned in its socket. As shown in the drawings, the outer portion of the arm p is inserted in a diametrical opening formed in the stem on the outer side of the collar I?, and the latter bears against the arm and clamps the latter in the opening. Upon loosening the collar the arm p can be adjusted in the opening of the stem, so as to lengthen or shorten its effective length, as may be necessary to change the throw of the arm. The spring o holds the collar l? against the arm p, andY also turns the stem N backward to its normal position when thearm p has cleared the stop q. The latter is attached to a collar, Q, which is secured to the lathe-bearing by a setscrew, q. The collar Q is provided with a number of differentlylocated openings, q, in either of which the stop q may be placed, as may be required by the character or design of the work to be produced. Two or more stops q may be employed, if necessary. The work j being attached to the faceplate A and the eccentric plate having been properly adjusted on the mandrel-plates F F by the screw H, the ro tation of the chuck causes the face-plate to be turned automatically on the eccentric plate,

thereby producing the desired design without attention on the part of the operator and insuring a correct and uniform spacing of the elements of the design which are successively produced. Every time the actuating-arm p comes in contact with a stop q the pawl Z is moved forward a certain distance and turns i the face-plate correspondingly. The extent of this movement is easily regulated by adjusting the arm p or the stop q, or both.

Instead ot'employing the pawl-movement hereinbefore described, the faceplate may be provided with a gear-rim, @and may be turned by a pinion, r', which is actuated by a starwheel, R, coming in contact with the stop q, as represented in Fig. l2.

I claim as my invention'- l. Ihe combination,with the mandrelplate, of an eccentric plate attached thereto, a faceplate mounted on said eccentric plate, and automatic feed mechanism by which the faceplate is automatically turned on the eccentric plate, substantially as set forth.

2. The combination,with the mandrelplate, of an eccentric plate connected with the mandrel-plate by a guide rib and groove, a screw whereby the eccentric-plate is adj usted on the mandrel-plate, a faceplate mounted on said eccentric plate, and automatic feed mechanism whereby the face-plate is automatically turned on the eccentric plate, substantially as set forth.

3. The combination, with the mandrel-plate, of the eccentric plate B, the faceplate A, provided with ratchet-teeth 7c, a detent, k, an actuating-pawl, Z, a head, L, having a stem, N, and an, actuating-arm, p, attached to said stem, substantially as set forth.

4. The combination, with the mandrel-plate,

'r OO IIO 374,405 il l of the eccentric plate B, the faceplate A, provided with ratchet-teeth k, a detent, k, an actuating-pawl, Z, a head, L, having a stem, N, an adjustable actuatinglarm, p, and a collar, P, whereby the arm p is held in place on the stem, substantially as set forth.

5. The combination, with the mandrelplate, of the eccentric plate B, the face-plate A, provided with ratchet-teeth 7c, a detent, 7c', an actuating-pawl, Z, a head, L, having a stem, N, an actuatingearm, p, and a spring, o, by which the stem is returned to its former position after having been actuated, substantially as set forth.

(5. The combination, with the face-plate A and eccentric plate B, of the mandrel-platelll, provided with an annular rib, f', and a plate, F', provided with a corresponding groove and secured against the plate F, substantially as set forth.

7. The combination, with the eccentric plate B, of the mandrel plate F, an adjustingscrew, H, arranged between said plates, a halfnut, I, seated in the plateF, and an adjustable follower, t', whereby said half-nut is held against the adjusting-screw, substantially as set forth.

8. The combination,with the grooved eccentric plate B, ofthe mandrel-plate F, provided with a dovetail rib, G, havingl one of its Wings severed from the base by a slit, j, and a setscrew, j, applied to said wing, substantially as set forth.

9. The combination, with the face-plate A, provided with an internal annular groove, c2, of the eccentric plate B, bolts c, seated in said eccentric plate and provided with heads c', which engage in the groove c2, and set-screws d, arranged in the eccentric plate and engaging with said bolts, substantially as set forth.

10. The combination, with the mandrelplate, an eccentric plate attached thereto, and a face-plate mounted Aon said eccentric plate, of a feed mechanism attached to the eccentric plate and provided with an actuatingarm, and 45 a fixed stop secured to the latter and adapted to come in contact with said aetuatingarm, substantially as set forth.

1l. The combination, with thc chuck and itsl feed mechanism provided with an actuating-arm, of the n1andrel-bearing, an adjustable collar secured thereto, and an adjustable stop secured to said collar and adapted to come in contact with said actuating ar1n,'sub' stantially as set forth.

Vitness Iny hand this 2d day of March, 1887.

FRED LEON GREGORY. 

